Can Eye Fatigue Cause Temporary Vision Decline Without Myopia Increase?

Q: Can Eye Fatigue Cause Temporary Vision Decline Without Myopia Increase?

Hello： When fatigued, the ciliary muscle's ability to accommodate may deteriorate, leading to blurred vision, and myopia may appear to worsen. <br>However, since measuring refractive error is instantaneous, it is possible that the measured prescription remains the same. <br>Visio

Eye fatigue and deterioration of uncorrected vision?

Hello Doctor, I have been experiencing eye fatigue recently.
I would like to ask if it is possible for fatigue and excessive eye use to lead to a decrease in uncorrected visual acuity (feeling like my myopia has worsened) even though my prescription remains unchanged? I visited a clinic due to my eye fatigue, and during the first visit, there was no indication of worsening myopia.
However, a few days later, I noticed a decrease in my vision upon waking up in the morning, so I went for a second visit.
The measurement was the same as the last time, and the doctor at the clinic did not provide an answer, which is why I am asking if this is a possibility.

Niming, 20~29 year old female. Ask Date: 2022/11/02

Dr. Gao Pilin reply Ophthalmology

Hello: When fatigued, the ciliary muscle's ability to accommodate may deteriorate, leading to blurred vision, and myopia may appear to worsen.
However, since measuring refractive error is instantaneous, it is possible that the measured prescription remains the same.
Vision is a dynamic adjustment, and the decreased accommodation ability of the ciliary muscle can result in blurred vision.
Therefore, the situation you are experiencing is indeed possible.

Reply Date: 2022/11/02

More Info

Eye fatigue, often referred to as asthenopia, can indeed lead to temporary declines in visual acuity without an actual increase in myopia. This phenomenon is particularly common among individuals who engage in prolonged near work, such as reading, using computers, or other activities that require intense focus on close objects.
When the eyes are overworked, the muscles that control eye movement and focus can become fatigued. This fatigue can manifest in various ways, including blurred vision, difficulty focusing, and even sensations of discomfort or strain. The visual system may struggle to maintain clarity, leading to a perception that one's vision has worsened, even if the refractive error (the degree of myopia or hyperopia) remains unchanged.

In your case, it sounds like you experienced a decline in visual clarity after periods of eye strain, which is not uncommon. The fact that your eye prescription remained stable during your visits to the eye clinic suggests that the underlying refractive error has not changed. Instead, what you are experiencing is likely a result of temporary visual fatigue.
Several factors can contribute to this temporary decline in vision due to eye fatigue:
1. Accommodation Fatigue: The eye's ability to focus on near objects is called accommodation. Prolonged near work can lead to a temporary inability to focus properly, resulting in blurred vision.

2. Dry Eyes: Extended periods of screen time or reading can reduce the frequency of blinking, leading to dry eyes. Dryness can cause discomfort and visual disturbances, contributing to the feeling of decreased visual acuity.

3. Muscle Strain: The extraocular muscles that control eye movement can become fatigued, leading to difficulty in maintaining proper alignment and focus, which can also result in temporary blurriness or distortion.

4. Visual Processing Fatigue: The brain's visual processing centers can become fatigued, particularly after intense visual tasks, leading to a temporary decline in visual performance.

To mitigate these symptoms and improve your visual comfort, consider the following strategies:
- Follow the 20-20-20 Rule: Every 20 minutes, take a 20-second break to look at something 20 feet away. This helps relax the eye muscles and reduces strain.

- Ensure Proper Lighting: Make sure your workspace is well-lit to reduce glare and strain on your eyes.

- Stay Hydrated: Drink plenty of water to help maintain moisture levels in your eyes.

- Use Artificial Tears: If you experience dryness, consider using lubricating eye drops to keep your eyes moist.

- Adjust Your Screen Settings: Ensure that your computer screen is at eye level and that the brightness and contrast are comfortable for your eyes.

- Regular Eye Exams: Continue to have regular check-ups with your eye care professional to monitor your eye health and address any concerns.

In conclusion, while eye fatigue can lead to temporary declines in visual acuity, it does not necessarily indicate a permanent change in your vision or an increase in myopia. If symptoms persist or worsen, it is essential to consult with an eye care professional for further evaluation and management.

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